更新的圖像

Question

我正在開發一個應用程序，使用一些圖像。我們需要在圖像上打印一些文字，但這並不是一個固定的意思，當更改變量值時會自動更改文字。簡單地說，我們在圖像上打印一個變量？

Answer 1

試試這個

public class Test extends UiApplication { 

     public static void main(String[] arg) { 
      Test app = new Test(); 
      app.enterEventDispatcher(); 
     } 

     public Test() { 
      MyScreen screen = new MyScreen(); 
      pushScreen(screen); 
     } 
    } 
    class MyScreen extends MainScreen { 
     LabelField label; 
     public MyScreen() { 
      label = new LabelField() { 
       protected void paint(Graphics g) { 
        Bitmap bitmap = Bitmap.getBitmapResource("bgimage.jpg"); 
        g.drawBitmap(0, 0, getWidth(), getHeight(), bitmap, 0, 0); 
        super.paint(g); 
       } 
      }; 

      ButtonField button = new ButtonField("update") { 
       protected void fieldChangeNotify(int context) { 
        update(); 
        super.fieldChangeNotify(context); 
       } 
      }; 

      add(label); 
      add(button); 
     } 

     public void setMessage(String message) { 
      synchronized (UiApplication.getEventLock()) { 
       label.setText(message); 
      } 
     } 

     private void update() { 
      LocationHandler handler = new LocationHandler(this); 
      handler.start(); 
     } 
    } 

    class LocationHandler extends Thread { 
     private MyScreen screen; 

     public LocationHandler(MyScreen screen) { 
      this.screen = screen; 
     } 

     public void run() { 

      Criteria criteria = new Criteria(); 
      criteria.setVerticalAccuracy(50); 
      criteria.setHorizontalAccuracy(50); 
      criteria.setCostAllowed(true); 
      criteria.setPreferredPowerConsumption(Criteria.POWER_USAGE_HIGH); 
      try { 

       LocationProvider provider = LocationProvider.getInstance(criteria); 
       Location location = provider.getLocation(-1); 
       String speed = location.getSpeed() + "m/s"; 
       screen.setMessage(speed); 
      } catch (LocationException e) { 
       e.printStackTrace(); 
      } catch (InterruptedException e) { 
       e.printStackTrace(); 
      } 

     } 
    }